Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a327a809a1655b0…

MALICIOUS

PDF

37.6 KB Created: 2020-10-11 18:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0eb3aaf8bd1a51ac7ba75a22c9927141 SHA-1: 98d34b1ca8238ae09c36a7b09e5dc86977de5eed SHA-256: 7a327a809a1655b0d4a48be05cdb62659d1266b92e8e97b6529455d76648eaaa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=fireboy+and+watergirl+6 In PDF document text
    • http://files.gbeinc.com/uploads/1/3/0/7/130776518/xukekusasafadud_mubov.pdfIn PDF document text
    • http://giwiti.rshawillustrations.com/uploads/1/3/1/4/131453506/7b7e4eb522.pdfIn PDF document text
    • http://files.kyocreations.com/uploads/1/3/0/7/130738528/sipuwakivilox.pdfIn PDF document text
    • http://firej.arborspringsbc.org/uploads/1/3/1/3/131398134/wajufafuku.pdfIn PDF document text
    • http://files.sydneywippman.com/uploads/1/3/1/3/131381612/fde95e168b50b.pdfIn PDF document text
    • https://site-1039398.mozfiles.com/files/1039398/89361790349.pdfIn PDF document text
    • https://site-1048292.mozfiles.com/files/1048292/98963584709.pdfIn PDF document text
    • https://site-1038985.mozfiles.com/files/1038985/12229486836.pdfIn PDF document text
    • https://site-1039324.mozfiles.com/files/1039324/vasimefominulamurigil.pdfIn PDF document text
    • https://site-1038514.mozfiles.com/files/1038514/ginarosevijemulev.pdfIn PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/67257054631.pdfIn PDF document text
    • https://site-1044015.mozfiles.com/files/1044015/bugevarolufuxori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/madden_nfl_mobile_hack_tool.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/1323/0759/files/facetime_on_pc_laptop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/9821/1999/files/diwekon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4891/0491/files/mikes_tech_shop_brooklyn.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/totuboxujewawuxafana.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5063 5256 bytes
SHA-256: b42213a56b423bd15d65da5c5168fc21f97e468b72cb5fbbe6f191a13932762a
font_01_sfnt_off00006262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6262 14596 bytes
SHA-256: b17f6db0f679c6649346cd4c62a35a7dafbf815e6f8a5c587cd7b58c24fd1f84

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